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Direct strength prediction of cold-formed steel fixed-ended singly-symmetric columns buckling in flexural–torsional modes
https://orcid.org/0000-0002-3974-5953
https://orcid.org/0000-0002-7994-2687
Abstract The work reported in this paper is a sequel of previous numerical investigations carried out by the authors on the post-buckling behaviour, strength and Direct Strength Method (DSM) design of cold-formed steel (CFS) fixed-ended plain and lipped channel columns (both singly-symmetric with respect to the major-axis) buckling in flexural–torsional modes and experiencing global-global interaction – a coupling phenomenon involving major-axis flexural–torsional () and minor-axis flexural () buckling that was first unveiled in those studies. In the specific context of plain and lipped channel columns, a DSM-based design approach for columns buckling in modes and failing in either pure or - interactive modes was developed and shown to provide accurate, mostly safe and reliable predictions of the experimental (only a few) and numerical failure loads available. The success of this research effort encouraged the authors to extend the scope of the investigation to fixed-ended columns with other singly-symmetric cross-section shapes, namely return-lip, web-stiffened and web/flange-stiffened lipped channels, hat-sections and rack-sections (deemed representative of any arbitrary singly-symmetric cross-section). The results attained during this investigation are presented and discussed in detail – they concern the post-buckling behaviour, strength and DSM-based design of the columns analysed, including fairly extensive failure load sets (Ansys non-linear shell finite element models are used to obtain them). The main output of this work is a DSM-based design approach for arbitrary CFS fixed-ended singly-symmetric columns exhibiting pure or - interactive failures.
Highlights Major-axis flexural–torsional (FMT) - minor-axis flexural (Fm) interaction in CFS columns. Fixed-ended singly-symmetric columns buckling in FMT modes and failing in FMT-Fm interactive modes. Numerical investigation of 1200 columns with several geometries, yield stresses and interaction levels. Column buckling and post-buckling (elastic and elastic–plastic) behaviour under FMT-Fm mode interaction. DSM-based design against FMT (pure) or FMT-Fm (interactive) failure of columns buckling in FMT modes.
Direct strength prediction of cold-formed steel fixed-ended singly-symmetric columns buckling in flexural–torsional modes
https://orcid.org/0000-0002-3974-5953
https://orcid.org/0000-0002-7994-2687
Abstract The work reported in this paper is a sequel of previous numerical investigations carried out by the authors on the post-buckling behaviour, strength and Direct Strength Method (DSM) design of cold-formed steel (CFS) fixed-ended plain and lipped channel columns (both singly-symmetric with respect to the major-axis) buckling in flexural–torsional modes and experiencing global-global interaction – a coupling phenomenon involving major-axis flexural–torsional () and minor-axis flexural () buckling that was first unveiled in those studies. In the specific context of plain and lipped channel columns, a DSM-based design approach for columns buckling in modes and failing in either pure or - interactive modes was developed and shown to provide accurate, mostly safe and reliable predictions of the experimental (only a few) and numerical failure loads available. The success of this research effort encouraged the authors to extend the scope of the investigation to fixed-ended columns with other singly-symmetric cross-section shapes, namely return-lip, web-stiffened and web/flange-stiffened lipped channels, hat-sections and rack-sections (deemed representative of any arbitrary singly-symmetric cross-section). The results attained during this investigation are presented and discussed in detail – they concern the post-buckling behaviour, strength and DSM-based design of the columns analysed, including fairly extensive failure load sets (Ansys non-linear shell finite element models are used to obtain them). The main output of this work is a DSM-based design approach for arbitrary CFS fixed-ended singly-symmetric columns exhibiting pure or - interactive failures.
Highlights Major-axis flexural–torsional (FMT) - minor-axis flexural (Fm) interaction in CFS columns. Fixed-ended singly-symmetric columns buckling in FMT modes and failing in FMT-Fm interactive modes. Numerical investigation of 1200 columns with several geometries, yield stresses and interaction levels. Column buckling and post-buckling (elastic and elastic–plastic) behaviour under FMT-Fm mode interaction. DSM-based design against FMT (pure) or FMT-Fm (interactive) failure of columns buckling in FMT modes.
Direct strength prediction of cold-formed steel fixed-ended singly-symmetric columns buckling in flexural–torsional modes
https://orcid.org/0000-0002-3974-5953
https://orcid.org/0000-0002-7994-2687
Abstract The work reported in this paper is a sequel of previous numerical investigations carried out by the authors on the post-buckling behaviour, strength and Direct Strength Method (DSM) design of cold-formed steel (CFS) fixed-ended plain and lipped channel columns (both singly-symmetric with respect to the major-axis) buckling in flexural–torsional modes and experiencing global-global interaction – a coupling phenomenon involving major-axis flexural–torsional () and minor-axis flexural () buckling that was first unveiled in those studies. In the specific context of plain and lipped channel columns, a DSM-based design approach for columns buckling in modes and failing in either pure or - interactive modes was developed and shown to provide accurate, mostly safe and reliable predictions of the experimental (only a few) and numerical failure loads available. The success of this research effort encouraged the authors to extend the scope of the investigation to fixed-ended columns with other singly-symmetric cross-section shapes, namely return-lip, web-stiffened and web/flange-stiffened lipped channels, hat-sections and rack-sections (deemed representative of any arbitrary singly-symmetric cross-section). The results attained during this investigation are presented and discussed in detail – they concern the post-buckling behaviour, strength and DSM-based design of the columns analysed, including fairly extensive failure load sets (Ansys non-linear shell finite element models are used to obtain them). The main output of this work is a DSM-based design approach for arbitrary CFS fixed-ended singly-symmetric columns exhibiting pure or - interactive failures.
Highlights Major-axis flexural–torsional (FMT) - minor-axis flexural (Fm) interaction in CFS columns. Fixed-ended singly-symmetric columns buckling in FMT modes and failing in FMT-Fm interactive modes. Numerical investigation of 1200 columns with several geometries, yield stresses and interaction levels. Column buckling and post-buckling (elastic and elastic–plastic) behaviour under FMT-Fm mode interaction. DSM-based design against FMT (pure) or FMT-Fm (interactive) failure of columns buckling in FMT modes.
Direct strength prediction of cold-formed steel fixed-ended singly-symmetric columns buckling in flexural–torsional modes
Cerqueira, Elisa (author) / Landesmann, Alexandre (author) / Camotim, Dinar (author) / Dinis, Pedro B. (author) / Martins, André D. (author)
Thin-Walled Structures ; 187
2023-03-24
Article (Journal)
Electronic Resource
English
Torsional-flexural Buckling of Singly Symmetric Cold-formed Steel Beam Columns
| British Library Conference Proceedings | 1998